kbs 2TV Music Bank' rehearsal was held at the public hall of Yeouido kbs New Pavilion in Yeongdeungpo-gu, Seoul on December 21st.
Apink Son Na-eun is on his way to work on the day.
About Music Bank
Music Bank is a South Korean music program which airs every Friday at 17:00 KST on KBS2. As of 2015, the show is also broadcast in more than a hundred countries through KBS World.
 Wikipedia